CN107340544B - A kind of the minute metallic particle on-line detecting system and method for high sensitivity - Google Patents
A kind of the minute metallic particle on-line detecting system and method for high sensitivity Download PDFInfo
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Abstract
The present invention relates to a kind of minute metallic particle on-line detecting system of high sensitivity and methods comprising sensor module, signal excitation and acquisition module and computer；The sensor module and the signal motivate and acquisition module carries out information exchange；The pumping signal that the sensor module is used to receive the signal excitation and acquisition module is transmitted to, on-line checking is carried out to minute metallic particle, and the signal that will test is transmitted in the signal excitation and acquisition module and is handled, treated, and signal is transmitted in the computer.The present invention problem low for current metallic particles detection sensor sensitivity, realizes the highly sensitive minute metallic particle on-line checking of large aperture；It can be widely applied to mechanical equipment lubricant oil metal wear particle on-line checking field.
Description
Technical field
The present invention relates to a kind of metallic particles detection system and methods, lubricate especially with regard to a kind of online mechanical equipment
The highly sensitive minute metallic particle on-line detecting system and method for oily metal wear particles.
Background technique
With the continuous development of Diagnosis Technique, Oil Monitoring Technique has become the weight of equipment running status monitoring
Technological means is wanted, and gradually develops into the science of a system.Wherein oil liquid on-line monitoring technique can be had in real time by it
Detecting to equipment attrition state for effect, and reflects the change procedure of equipment attrition situation, therefore one between becoming in recent years
Research hotspot, and an individual branches being developing progressively as oil liquid detection technology.
Currently, research institution has been developed that a plurality of types of wear particle detection sensors, the principle packet of main foundation both at home and abroad
It includes: optical principle (light scattering, optical diffraction), ultrasonic wave principle, electrical principles (capacitor, resistance, inductance) and image.Comprehensive Correlation
The characteristics of various kinds of sensors, optics wear particle detection sensor are highly prone to the influence of bubble in oil liquid and generate the detection of mistake
As a result, ultrasonic type sensor is then easy the interference by ambient noise, and temperature stability is poor, significantly limits the type
Use of the sensor under large scale equipment and complex working condition.Image-type wear particle detection sensor structure is complicated, judges by color
Abrasive particulate material attribute, is illuminated by the light and is affected, and detection speed and precision and image processing algorithm are in close relations, it is difficult to protect simultaneously
Card high-precision and real-time.Wear particle detection sensor structure form based on electrical principles is simple, and temperature stability is good, anti-background
Noise immune is strong, but is easy to be influenced by outside electromagnetic interference, therefore must carry out necessary electromagnetism in sensor systems
Shielding.
Multiple domestic and international research institutions have carried out a large amount of scientific research, Akron university around the direction simultaneously
The fluid channel abrasive grain monitoring sensor for having studied single coil structure, parallel coil structure and planar coil construction, realizes highest
The detection of 20 μm of iron particles and 55 μm of copper particles, but due to the fluid channel (internal diameter ≈ 1mm) that sensor all uses, therefore, it is difficult to
Engineering is applied in practice.The domestic Maritime Affairs University Of Dalian, Nanjing Aero-Space University sense planar spiral winding formula abrasive grain
Device is studied.Shijiazhuang Ordnance Engineering College has studied Double-coil type wear particle detection sensor, analyzes ferromagnetic particle
And non-ferromagnetic debris pass through sensor when magnetic signature and sensor output characteristics, can successfully detect 100 μm of iron
Magnetic-particle and 500 μm of non-ferromagnetic debris.The magnetic field model of the differential type sensor of China Science & Technology University's exploitation, the biography
Sensor internal diameter 25mm can successfully detect 200~300 μm of ferromagnetic particles and 700 μm of non ferromagnetic debris.But domestic big portion at present
Divide research also in laboratory stage, is unable to reach engineering requirement.
The main problem that inductance type abrasive grain sensor development at present faces is sensor detection sensitivity and gauge hole
There are contradiction between diameter, the higher sensor of detection accuracy generally uses fluid channel (aperture < 1mm), it is difficult in practical projects
It uses, the wear particle detection sensor detection sensitivity of large aperture is relatively low, therefore for how to improve large aperture wear particle detection
Sensor detection sensitivity is a urgent problem to be solved.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of minute metallic particle on-line detecting systems of high sensitivity
And method, for the low problem of current metallic particles detection sensor sensitivity, the high sensitivity for realizing large aperture is small
Metallic particles on-line checking.
To achieve the above object, the present invention takes following technical scheme: a kind of minute metallic particle of high sensitivity is online
Detection system, it is characterised in that: the system includes sensor module, signal excitation and acquisition module and computer；The sensing
Device module and the signal motivate and acquisition module carries out information exchange；The sensor module is for receiving the signal excitation
And the pumping signal that acquisition module is transmitted to, on-line checking is carried out to minute metallic particle, and the signal that will test is transmitted to
It is handled in the signal excitation and acquisition module, treated, and signal is transmitted in the computer.
Further, the sensor module include the first excitation coil, the second excitation coil, the first resonant excitation capacitor,
Second resonant excitation capacitor, induction coil, resonant inducing capacitor and coil base；First excitation coil, the second excitation line
Circle and induction coil are all wound on the coil base；First excitation coil, the second excitation coil are located at the coil
Matrix two sides, the first excitation coil one end first connecting line series connection adjacent with second excitation coil, described the
The one excitation coil other end is connected through the second connecting line with second excitation coil；Positioned at first connecting line and described the
It has successively been arranged in parallel the first resonant excitation capacitor, signal excitation and acquisition module between two connecting lines and the second resonance swashs
Capacitor is encouraged, and the first resonant excitation capacitor is located at first excitation coil side, the second resonant excitation capacitor position
In second excitation coil side；The induction coil is located in the middle part of the coil base, and the induction coil both ends are drawn
It exports after the parallel connection resonant inducing capacitor between line, is connect with signal excitation and acquisition module.
Further, first excitation coil, the second excitation coil, the first connecting line, the second connecting line and induction coil
All use diameter for the copper enameled wire of 0.2mm.
Further, first excitation coil and second excitation coil the number of turns is identical and coiling is contrary；The induction
The number of turns of coil is greater than the number of turns of first excitation coil or second excitation coil, and direction is arbitrarily arranged.
Further, the number of turns of first excitation coil and the second excitation coil is all made of 255 circles, the induction coil
The number of turns is 300 circles.
Further, be provided with sensor housing outside the sensor module, be located at the sensor module with it is described
Also be disposed with magnetic masking layer and shield layer between sensor housing, the shield layer close to the sensor module,
The magnetic masking layer is located on the outside of the shield layer.
Further, the coil base is made of processable ceramics material, thermal conductivity 1.71W/m.k.
Further, the signal excitation and acquisition module include signal driving source and signal acquisition process module；The letter
Number driving source is connected in parallel between the first connecting line and the second connecting line in the sensor module, the signal acquisition process mould
Block is connect with the induction coil output end in the sensor module.
Further, the signal driving source include two square wave excitation signal input parts, two signal booster amplifiers and
Two signal shaping modules；Square wave excitation signal is all transmitted to a signal liter by each square wave excitation signal input part
After pressing amplifier processing, it is transmitted to a signal shaping module, described the is transmitted to after the signal shaping resume module
One excitation coil or second excitation coil；The signal acquisition process module includes resonance amplifier, the filtering of 50Hz power frequency
Device, anti alias filter, lock-in amplifier and converter；The signal that the induction coil is transmitted to is put through the resonance amplifier
After big processing, successively after the processing of the 50Hz frequency filter, anti alias filter and lock-in amplifier, it is transmitted to the AD and turns
Parallel operation exports inductive signal after the converter analog-to-digital conversion process.
A kind of detection method of the minute metallic particle on-line detecting system based on above-mentioned high sensitivity, it is characterised in that packet
Include following steps: 1) the first excitation coil, the second excitation coil and induction coil match resonant capacitance according to condition of resonance；2) when
When there is no metallic particles to pass through sensor module, excitation coil Static Electro inductance value are as follows:
In formula, μ0For space permeability, N is coil turn, d1For mean diameter of coil,A is coil width, and r is excitation coil internal diameter；The mutual inductance value M of two excitation coils are as follows:
In formula,λi=d2/(2ki),liFor different coils
Between distance, d2For coil outer diameter；3) signal driving source is passed through the first excitation coil from square wave to series connection, the second excitation coil
Pumping signal, then shunt circuit amplitude-frequency characteristic are as follows:
In formula, ω0For resonance angular frequency, Q is the shunt circuit LC quality factor, and the π of ω=2 f, f are exciting signal frequency；4)
Metallic particles can change coil magnetic resistance when entering any excitation coil, show as coil inductance and change；When radius is ra
Ferromagnetic particle enter internal diameter to be r wide when being in any excitation coil of a, generated inductance variable quantity are as follows:
Generated circuit impedance changes △ Z=j ω △ L, μrFor relative permeability；Excitation coil uses resonance principle
Afterwards, the variation of coil impedance caused by metallic particles are as follows:
C is matching resonant capacitance；The difference for the magnetic flux that two excitation coils generate at induction coil position at this time is to feel
Coil flux amount is answered to change, value are as follows: △ Φ=△ Z*I, I are square wave excitation signal；Induction coil exports induced electromotive force are as follows:
E=-j ω N △ Φ；5) it is μ V grades by the output induced electromotive force amplitude order of magnitude that step 4) obtains, is with outside noise signal
The same order of magnitude amplifies faint induced electromotive force signal by induction coil, amplification factor are as follows:
F is exciting signal frequency；6) small-signal after step 5) amplifies through power frequency filtering and anti-aliasing filtering after,
Locking phase amplification is carried out by lock-in amplifier, final induction coil exports electromotive force:
The invention adopts the above technical scheme, which has the following advantages: 1, LC resonance principle is introduced by the present invention
Wear particle detection sensor module, the first, second excitation coil is oppositely wound and is connected in series, and specific frequency is passed through into excitation coil
Rate sine ac power supply, and corresponding resonant excitation capacitor is matched according to condition of resonance, to improve excitation coil impedance variations spirit
Sensitivity.2, the induction coil independence coiling that uses of the present invention, direction is any, according to condition of resonance using with identical frequency as the line of induction
Circle matching resonant inducing capacitor, to enhance sensor detection effect.3, the present invention causes conventional abrasive particles detection sensor abrasive grain
Coil inductance change transitions be LC resonance circuit impedance variation, effectively increase transducer sensitivity.4, due to sensing
Device output signal is microvolt grade, is the same order of magnitude with ambient noise, therefore the present invention directly carries out sensor output signal
The phenomenon that amplification will cause signal noise low, cannot effectively identify when minute metallic abrasive grain passes through sensor.5, the present invention uses
Phase lock amplifying technology carries out pre-treatment to sensor module output signal, will regard with pumping signal with the signal component of frequency in signal
It is acquired and amplifies for useful signal, and the signal of other frequency contents is all considered as invalid signals and is filtered out, it can be effective
Improve Signal-to-Noise so that improve sensor detection sensitivity.6, the present invention is that sensor module is provided with electromagnetic shielding
Layer, wherein shield layer selects the red copper material of low-resistivity, and resistivity is 0.018 Ω mm2/m；Magnetic masking layer is selected high
The permalloy material of magnetic conductivity, low-coercivity, relative permeability are 20000~200000H/m.Cell winding matrix uses
Lazy magnetic material processable ceramic is made, which is 1.71W/m.k, generates shadow to magnetic field reducing coil base
Transmitting of the oil liquid heat to coil can be reduced while sound to impact system detection performance, enhance the anti-interference ability of system
And stability.7, resonance principle is introduced to sensor module by the present invention, replaces tradition electricity using the impedance variations of resonance circuit
The inductance on road changes, while carrying out a frequency-selecting and amplification to signal using induction coil resonance feature.Signal excitation and detection
Module carries out secondary frequency-selecting and amplification to signal using phase lock amplifying technology, greatly improves the sensitivity of detection system, contracts
Small minimum detectable abrasive grain diameter.
In conclusion the present invention can be widely applied to mechanical equipment lubricant oil metal wear particle on-line checking field
In.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is sensor of the invention modular circuit structural schematic diagram；
Fig. 3 is sensor of the invention modular structure schematic diagram；
Fig. 4 is sensor of the invention module equivalent circuit diagram；
Fig. 5 is signal excitation and acquisition module structural schematic diagram of the invention；
Fig. 6 is that ferromagnetic particle of the present invention passes through caused coil inductance variation schematic diagram when sensor module；
Fig. 7 is that ferromagnetic particle of the present invention passes through caused circuit impedance variation schematic diagram when sensor；
Fig. 8 is output signal schematic diagram when 75 μm of ferromagnetic particles of the invention pass through sensor；
Fig. 9 is output signal schematic diagram when 250 μm of non-ferromagnetic debris of the invention pass through sensor.
Specific embodiment
The present invention is using identical sinusoidal ac is passed through into two oppositely wound excitation coils, in two excitation coils
Inside can generate the contrary magnetic field equal in magnitude of dynamic change respectively, and induction coil is located in the middle part of two excitation coils, when
Magnetic field strength is zero at induction coil when not having metallic particles to pass through sensor, therefore does not export induced electromotive force, works as ferromagnetism
When particle passes through sensor, humidification can be generated to coil inside magnetic field, it can be right when non-ferromagnetic debris enters sensor
Coil inside magnetic field generates abated effect, causes two excitation coil magnetic fields uneven, and induction coil magnetic field is not zero, output induction
Electromotive force.The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention provides a kind of minute metallic particle on-line detecting system of high sensitivity comprising sensing
Device module, signal excitation and acquisition module and computer.Sensor module and signal motivate and acquisition module carries out information exchange；
The pumping signal that sensor module is used to receive signal excitation and acquisition module is transmitted to, examines minute metallic particle online
It surveys, and the signal that will test is transmitted in signal excitation and acquisition module and is handled, treated, and signal is transmitted to calculating
In machine.
In above-described embodiment, as shown in Figure 2 and Figure 3, sensor module include the first excitation coil 1, the second excitation coil 2,
First resonant excitation capacitor 3, the second resonant excitation capacitor 4, induction coil 5, resonant inducing capacitor 6 and coil base 7.
First excitation coil 1, the second excitation coil 2 and induction coil 5 are all wound on coil base 7.First excitation line
The 1, second excitation coil 2 of circle is located at 7 two sides of coil base, the first excitation coil 1 one end adjacent with the second excitation coil 2 the
The series connection of one connecting line, 1 other end of the first excitation coil are connected through the second connecting line with the second excitation coil 2.Positioned at the first connection
The first resonant excitation capacitor 3, signal excitation and acquisition module, the second resonance have successively been arranged in parallel between line and the second connecting line
Capacitor 4 is motivated, and the first resonant excitation capacitor 3 is located at 1 side of the first excitation coil, the second resonant excitation capacitor 4 is located at second
2 side of excitation coil.Induction coil 5 is located at 7 middle part of coil base, parallel resonance induction between 5 both ends lead-out wire of induction coil
It exports after capacitor 6, is connect with signal excitation and acquisition module.The present invention swashs to make each coil working in resonant state for two
It encourages coil and is equipped with the first resonant excitation capacitor 3, the second resonant excitation capacitor 4, be equipped with resonant inducing capacitor for induction coil 5
6。
In a preferred embodiment, the first excitation coil 1, the second excitation coil 2, the first connecting line, the second connecting line
All use diameter for the copper enameled wire of 0.2mm with induction coil 5.
In a preferred embodiment, the first excitation coil 1 is identical with 2 the number of turns of the second excitation coil and coiling direction phase
Instead；The number of turns of induction coil 5 is greater than the number of turns of the first excitation coil 1 (or second excitation coil 2), and direction can be arbitrarily arranged.
In the present embodiment, the number of turns of the first excitation coil 1 and the second excitation coil 2 is all made of 255 circles, and the number of turns of induction coil 5 is excellent
It is selected as 300 circles.
In being preferably implemented at one, for the anti-interference ability for enhancing sensor module, it is provided with outside sensor module
Sensor housing 10 is also disposed with magnetic masking layer 11 and shield layer between sensor module and sensor housing 10
12, for shield layer 12 close to sensor module, magnetic masking layer 11 is located at 12 outside of shield layer.Wherein magnetic masking layer 11 is using high
The permalloy material (relative permeability is 20000~200000H/m) of magnetic conductivity, low-coercivity, shield layer 12 is using low
The red copper material of resistivity (resistivity is 0.018 Ω mm2/m).
In being preferably implemented at one, since sensor module working environment oil liquid temperature is generally higher than 90 DEG C, to reduce oil
Influence of the liquid heat to coil each in sensor module, coil base 7 are made of processable ceramics material, and thermal conductivity is
1.71W/m.k can effectively reduce transmitting of the oil liquid heat to each coil.
In the various embodiments described above, as shown in figure 5, signal excitation and acquisition module include signal driving source 8 and signal acquisition
Processing module 9.Signal driving source 8 is connected in parallel between the first connecting line and the second connecting line, signal acquisition process module 9 and induction
The connection of 5 output end of coil.Signal driving source 8 includes two square wave excitation signal input parts, two signal booster amplifiers and two
A signal shaping module；Square wave excitation signal is all transmitted at a signal booster amplifier by each square wave excitation signal input part
After reason, it is transmitted to a signal shaping module, the first excitation coil 1 or the second excitation line are transmitted to after signal shaping resume module
Circle 2.Signal acquisition process module 9 includes resonance amplifier, 50Hz frequency filter, anti alias filter, lock-in amplifier and AD
Converter；The signal that induction coil 5 is transmitted to is after resonance amplifier enhanced processing, successively through 50Hz frequency filter, anti-mixed
After filter and lock-in amplifier processing, it is transmitted to converter, exports inductive signal after converter analog-to-digital conversion process.
In the use of the present invention, can be generated inside the first excitation coil 1, the second excitation coil 2 when sensor module static state
Contrary alternating magnetic field equal in magnitude, when not having metallic particles to pass through sensor module, two magnetic fields can be in induction coil 5
Place offsets each other, and induction coil magnetic flux change is 0, does not export induced electromotive force.When metallic particles enters sensor, can change
Become a certain excitation coil magnetic field strength, causes the first excitation coil 1,2 magnetic field of the second excitation coil unbalanced, lead to induction coil
Magnetic flux is not zero at 5, and induction coil exports induced electromotive force, and this electromotive force size increases with metallic particles diameter and increased
Greatly.
The present invention is based on said detecting systems, also provide a kind of minute metallic particle online test method of high sensitivity,
Itself the following steps are included:
1) as shown in figure 4, being matched for the first excitation coil 1, the second excitation coil 2 and induction coil 5 according to condition of resonance
Resonant capacitance；Wherein, condition of resonance are as follows:
In formula, f is exciting signal frequency, and L is coil inductance, and r is Coil resistance, and C is matching resonant capacitance.
When driving frequency selects, if underfrequency, non-ferromagnetic metal particle cannot be formed when passing through sensor module
Vortex, therefore sensor module cannot effectively detect non-ferromagnetic debris, if frequency is excessively high, inside ferromagnetic particle
It will form biggish vortex and inhibit the humidification of ferromagnetic particle external magnetic field, therefore the detection of ferromagnetic particle can be reduced
Effect.Therefore, the Comprehensive Correlation present invention is final determines that sensor excitation frequency is preferably 300KHz.
2) when there is no metallic particles to pass through sensor module, coil Static Electro inductance value are as follows:
In formula, μ0For space permeability, N is coil turn, d1For mean diameter of coil, A is coil width.
The mutual inductance value M of two excitation coils are as follows:
In formula,λi=d2/(2ki),liFor different coils
Between distance, d2 is coil outer diameter, wherein i=1,2,3；It is 500 μ H, two excitations by calculating excitation coil inductance value of the present invention
Coil mutual inductance is 75 μ H, and induction coil self-induction is 215 μ H.
3) it is 300KHz that signal driving source 8, which is passed through the first excitation coil 1 from frequency to series connection, the second excitation coil 2,
Amplitude is the square wave excitation signal of 5V, and square wave excitation signal I can be unfolded by Fourier transformation are as follows:
I=4*I/ π (sin ω t+1/3sin3 ω t+1/5sin5 ω t+1/7sin7 ω t+ ...), (4)
In formula, the π of ω=2 f, f are exciting signal frequency.
Shunt circuit amplitude-frequency characteristic αv(j ω) are as follows:
In formula, ω0For resonance angular frequency, Q is the shunt circuit LC quality factor.It can be seen that LC antiresonant circuit can protect
Resonance signal is stayed, and disresonance signal is inhibited, therefore square wave excitation signal by the first excitation coil 1 and second by being swashed
The sinusoidal excitation signal of same frequency is converted into after encouraging the excitation coil circuit of the composition of coil 2.
4) as shown in fig. 6, metallic particles can change coil magnetic resistance when entering any excitation coil, coil inductance is shown as
It changes.When radius is raFerromagnetic particle enter internal diameter to be r wide when being in any excitation coil of a, it is generated
Inductance variable quantity △ L are as follows:
Generated circuit impedance changes △ Z=j ω △ L.
After excitation coil uses resonance principle, the variation △ Z of coil impedance caused by metallic particles are as follows:
As shown in Figure 7, it is known that after excitation coil uses antiresonant circuit, the change of the circuit impedance as caused by metallic particles
Change the impedance variations for being far longer than and not using resonance principle, and sensor module sensitivity is improved with this principle.
The difference for the magnetic flux that two excitation coils generate at induction coil position at this time is induction coil magnetic flux change,
Its value △ Φ are as follows:
△ Φ=△ Z*I； (8)
Induction coil exports induced electromotive force E are as follows:
E=-j ω N △ Φ. (9)
5) it is μ V grades by the output induced electromotive force amplitude order of magnitude that step 4) obtains, is same number with outside noise signal
Magnitude need to be by induction coil resonant state again to enable detection system effectively to detect the faint induced electromotive force signal
It is secondary that signal is filtered and is amplified, to enhance Signal-to-Noise.Excitation coil energy under the parallel resonance state known to formula (5)
Enough reservations inhibit other frequency band signals with resonance frequency homogenous frequency signal simultaneously, while induction coil can also be to faint induction electric
Gesture signal amplifies, amplification factor are as follows:
6) small-signal after step 5) amplifies is carried out after power frequency filtering and anti-aliasing filtering by lock-in amplifier
Locking phase amplification, final induction coil export electromotive force；Wherein, lock-in amplifier reference signal is that frequency is identical as resonance frequency,
Amplitude is the standard sine signal of 5V, and signal amplification factor is 100 times；
The present invention exports induced electromotive force signal feature for induction coil, to be further ensured that the suitable of the small-signal
Benefit is extracted, and phase lock amplifying technology is applied in signal acquisition.
Wherein, induction coil exports electromotive force EoutAre as follows:
In summary it is found that sensor output electromotive force and coil parameter (the number of turns N, inductance L) pumping signal parameter (frequency
f0, electric current I) and metallic particles parameter (radius ra, relative permeability μr) etc. relating to parameters, and present nonlinear characteristic.Due to difference
Influence of attribute (the ferromagnetism and nonferromagnetic) metallic particles to magnetic field is different, and ferromagnetic particle can reinforce external magnetic field, non-ferric
Magnetic-particle can weaken external magnetic field, therefore sensor can export the induction of out of phase when different attribute particle passes through sensor
Electromotive force.When 75 microns of diameter of ferromagnetic particle and 250 microns of diameter of non-ferromagnetic debris are passed through sensor, sensor
Output signal difference is as shown in Figure 8, Figure 9.Dotted line is the collected signal of traditional sensors in figure, and solid line collects for the present invention
Signal, it is seen that there are obvious phase differences for sensor output signal when different attribute metallic particles passes through sensor, therefore can be with
Phase difference judges metal particle material attribute whereby, meanwhile, it can find that the present invention can be by sensor detection sensitivity by comparison
It is substantially improved.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the shape of each component are all can be with
It is varied, based on the technical solution of the present invention, the improvement and wait that all principles according to the present invention carry out individual part
With transformation, should not exclude except protection scope of the present invention.
Claims (1)
1. a kind of detection method based on highly sensitive minute metallic particle on-line detecting system, it is characterised in that: the system
Including sensor module, signal excitation and acquisition module and computer；The sensor module and the signal are motivated and are acquired
Module carries out information exchange；The excitation letter that the sensor module is used to receive the signal excitation and acquisition module is transmitted to
Number, on-line checking is carried out to minute metallic particle, and the signal that will test is transmitted in the signal excitation and acquisition module
It is handled, treated, and signal is transmitted in the computer；
The sensor module includes the first excitation coil, the second excitation coil, the first resonant excitation capacitor, the second resonant excitation
Capacitor, induction coil, resonant inducing capacitor and coil base；
First excitation coil, the second excitation coil and induction coil are all wound on the coil base；Described first swashs
Encourage coil, the second excitation coil is located at the coil base two sides, first excitation coil and the second excitation coil phase
Adjacent the first connecting line of one end series connection, the first excitation coil other end is through the second connecting line and second excitation coil
Series connection；The first resonant excitation electricity has successively been arranged in parallel between first connecting line and second connecting line
Appearance, signal excitation and acquisition module and the second resonant excitation capacitor, and the first resonant excitation capacitor is located at described first and swashs
Coil side is encouraged, the second resonant excitation capacitor is located at second excitation coil side；The induction coil is located at described
In the middle part of coil base, exported after the parallel connection resonant inducing capacitor between the lead-out wire of the induction coil both ends, with the signal
Excitation and acquisition module connection；
The signal excitation and acquisition module include signal driving source and signal acquisition process module；The signal driving source is in parallel
Between the first connecting line and the second connecting line in the sensor module, the signal acquisition process module and the sensing
Induction coil output end connection in device module；
The signal driving source includes two square wave excitation signal input parts, two signal booster amplifiers and two signal shapings
Module；Square wave excitation signal is all transmitted to a signal booster amplifier and handled by each square wave excitation signal input part
Afterwards, be transmitted to a signal shaping module, be transmitted to after the signal shaping resume module first excitation coil or
Second excitation coil；The signal acquisition process module includes resonance amplifier, 50Hz frequency filter, anti-aliasing filtering
Device, lock-in amplifier and converter；The signal that the induction coil is transmitted to after the resonance amplifier enhanced processing, according to
It is secondary through the 50Hz frequency filter, anti alias filter and lock-in amplifier processing after, the converter is transmitted to, through described
Inductive signal is exported after converter analog-to-digital conversion process；
First excitation coil, the second excitation coil, the first connecting line, the second connecting line and induction coil all use diameter for
The copper enameled wire of 0.2mm；
First excitation coil and second excitation coil the number of turns is identical and coiling is contrary；The number of turns of the induction coil is big
In the number of turns of first excitation coil or second excitation coil, direction is arbitrarily arranged；
The number of turns of first excitation coil and the second excitation coil is all made of 255 circles, and the number of turns of the induction coil is 300
Circle；
Be provided with sensor housing outside the sensor module, be located at the sensor module and the sensor housing it
Between be also disposed with magnetic masking layer and shield layer, the shield layer is close to the sensor module, the magnetic masking layer
On the outside of the shield layer；
The coil base is made of processable ceramics material, thermal conductivity 1.71W/m.k；
It is described that detection method includes the following steps:
1) the first excitation coil, the second excitation coil and induction coil match resonant capacitance according to condition of resonance；
2) when there is no metallic particles to pass through sensor module, excitation coil Static Electro inductance value are as follows:
In formula, μ0For space permeability, N is coil turn, d1For mean diameter of coil, A is
Coil width, r are excitation coil internal diameter；
The mutual inductance value M of two excitation coils are as follows:
In formula,λi=d2/(2ki),liFor different coil-spans
From d2For coil outer diameter；
3) signal driving source is passed through the first excitation coil from square wave excitation signal to series connection, the second excitation coil, then in parallel
Circuit amplitude-frequency characteristic are as follows:
In formula, ω0For resonance angular frequency, Q is the shunt circuit LC quality factor, and the π of ω=2 f, f are exciting signal frequency；
4) coil magnetic resistance can be changed when metallic particles enters any excitation coil, coil inductance is shown as and change；When half
Diameter is raFerromagnetic particle enter internal diameter to be r wide when being in any excitation coil of a, generated inductance variable quantity are as follows:
Generated circuit impedance change Delta Z=j ω Δ L, μrFor relative permeability；
After excitation coil uses resonance principle, the variation of coil impedance caused by metallic particles are as follows:
In formula, C is matching resonant capacitance；
The difference for the magnetic flux that two excitation coils generate at induction coil position at this time is induction coil magnetic flux change, value
Are as follows:
ΔΦ=Δ Z*I；
Wherein, I is square wave excitation signal；
Induction coil exports induced electromotive force are as follows:
E=-j ω N ΔΦ；
5) it is μ V grades by the output induced electromotive force amplitude order of magnitude that step 4) obtains, is same quantity with outside noise signal
Grade, amplifies faint induced electromotive force signal by induction coil, amplification factor are as follows:
In formula, f is exciting signal frequency；
6) small-signal after step 5) amplifies carries out locking phase by lock-in amplifier after power frequency filtering and anti-aliasing filtering
Amplification, final induction coil export electromotive force:
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